Author： Sheppard T. McShane H. B.
Publisher： Maney Publishing
ISSN： 1743-2901
Source： Powder Metallurgy, Vol.23, Iss.3, 1980-01, pp. : 120-125
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Abstract
Mathematical equations are developed expressing the strength of a cold-pressed compact as a function of pressure, density, and particle size. Experimental investigation involving an aluminium-magnesium suicide powder reinforced with B2O3–SiO2 glass shows that the form of the density and pressure relationships are correct but that the effect of particle size must be described by bonding energy rather than geometrical considerations. The results show remarkable agreement with theory by confirming the prediction that a compact will have zero strength at a theoretical density of 78·6%. Experiments conducted on compacts which were subsequently sintered show that the strength is proportional to the inverse of the sintering temperature and thus confirm the form of Coble's sintering equation.
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